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11. TROUBLESHOOTING
11. TROUBLESHOOTING
11.1 Trouble at start-up
CAUTION
Excessive adjustment or change of parameter setting must not be made as it will
make operation instable.
POINT
Using the MR Configurator, you can refer to unrotated servo motor reasons,
etc.
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
No. Start-up sequence Fault Investigation Possible cause Reference
Not improved if connectors
CN2, CN3 and CN6 are
disconnected.
1. Power supply voltage fault
2. Servo amplifier is faulty.
Improved when connectors
CN6 is disconnected.
Power supply of CN6 cabling is
shorted.
Improved when connector
CN2 is disconnected.
1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
LED is not lit.
LED flickers.
Improved when connector
CN3 is disconnected.
Power supply of CN3 cabling is
shorted.
1 Power on
Alarm occurs. Refer to section 14.4 and remove cause. Section 14.4
Alarm occurs. Refer to section 14.4 and remove cause. Section 14.4 2 Switch on servo-on
(RYn0) signal.
Servo motor shaft is
not servo-locked
(is free).
1. Check the display to see if
the servo amplifier is ready
to operate.
2. Check the external I/O
signal indication to see if
the servo-on (RYn0) signal
is ON.
1. Servo-on (RYn0) is not input.
(Wiring mistake)
2. 24VDC power is not supplied
to DICOM.
Section 8.5.4
Rotation ripples
(speed fluctuations)
are large at low
speed.
Make gain adjustment in the
following procedure.
1. Increase the auto tuning
response level.
2. Repeat acceleration and
deceleration several times
to complete auto tuning.
Gain adjustment fault Chapter 9
3 Gain adjustment
Large load inertia
moment causes the
servo motor shaft to
oscillate side to side.
If the servo motor may be run
with safety, repeat
acceleration and deceleration
several times to complete
auto tuning.
Gain adjustment fault Chapter 9
4 Cyclic operation Position shift occurs Confirm the cumulative
command pulses, cumulative
feedback pulses and actual
servo motor position.
Pulse counting error, etc.
due to noise.